X0306 4 2022-01-12 0 0001561550 Datadog, Inc. DDOG 0001783990 Pomel Olivier C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 1 1 0 0 Chief Executive Officer Class A Common Stock 2022-01-12 4 C 0 145472 0.00 A 387138 D Class A Common Stock 2022-01-12 4 S 0 5748 145.1169 D 381390 D Class A Common Stock 2022-01-12 4 S 0 46677 146.0527 D 334713 D Class A Common Stock 2022-01-12 4 S 0 19132 147.07 D 315581 D Class A Common Stock 2022-01-12 4 S 0 17477 147.9982 D 298104 D Class A Common Stock 2022-01-12 4 S 0 5080 149.1282 D 293024 D Class A Common Stock 2022-01-12 4 S 0 23060 150.0654 D 269964 D Class A Common Stock 2022-01-12 4 S 0 11232 150.9996 D 258732 D Class A Common Stock 2022-01-12 4 S 0 16166 152.5998 D 242566 D Class A Common Stock 2022-01-12 4 S 0 900 153.43 D 241666 D Class A Common Stock 1320 I By GRAT Class B Common Stock 2022-01-12 4 C 0 145472 0.00 D Class A Common Stock 145472 8305854 D Class B Common Stock Class A Common Stock 3339930 3339930 I By GRAT Each share of Class B Common Stock is convertible into an equal number of shares of Class A Common Stock at any time, at the holder's election, and has no expiration date. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon the earliest of: (i) any transfer, whether or not for value, except for certain "Permitted Transfers" as defined in the Issuer's amended and restated certificate of incorporation, (ii) the nine-month anniversary of the death of the Reporting Person in the case of shares held directly or in a trustee capacity, and (iii) the tenth anniversary of the Issuer's initial public offering of its Class A Common Stock. Shares sold pursuant to a 10b5-1 plan entered into on June 14, 2021. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $144.55 to $145.54. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $145.55 to $146.54. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $146.56 to $147.545. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $147.56 to $148.55. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $148.59 to $149.58. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $149.59 to $150.56. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $150.65 to $151.49. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $152.18 to $153.03. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Shares are held by the Olivier Pomel 2018 GRAT. Olivier Pomel, by /s/ Ron A. Metzger, Attorney-in-Fact 2022-01-14